The U.S. Navy exercised a $93.8 million contract modification option to Northrop Grumman Corporation for detail design and the procurement of long-lead-time material on the LHA 6 amphibious assault ship program. awarded in July 2005. increased to $203.7 million. has the potential to reach $264 million. advanced planning and systems engineering. authorization for LHA 6's detail design. Future. part of the Sea Base. Island (LHD 8), currently under construction. support of amphibious operations.